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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands		3 Months Ended												12 Months Ended
	Oct. 05, 2018	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2015 $ / shares	Sep. 30, 2018 USD ($) segment joint_venture $ / shares		Sep. 30, 2017 USD ($) $ / shares		Sep. 30, 2016 USD ($) $ / shares		Oct. 01, 2018 USD ($)
PRINCIPLES OF CONSOLIDATION [Abstract]
Percentage of interest in subsidiary		100.00%												100.00%
NATURE OF BUSINESS AND INDUSTRY SEGMENT INFORMATION [Abstract]
Number of reporting segments | segment														3
CASH AND CASH EQUIVALENTS AND FEDERAL FUNDS SOLD [Abstract]
Terms of FHLB advances														90 days
Reserve balances in cash or on deposit with FRB (Federal Reserve Bank)		$ 16,500				$ 1,500								$ 16,500		$ 1,500
Investment Holdings [Line Items]
Number of joint venture LLC's | joint_venture														5
Joint venture ownership interest in each of the joint ventures														80.00%
Retained earnings		213,048				167,164								$ 213,048		167,164
SECURITIES [Abstract]
Recorded balance		5,413				0								5,413		0
Other than temporary impairment														0		0		$ 0
Transfers
Aggregate unpaid balance of loans serviced for others		$ 134,000				$ 21,800								$ 134,000		$ 21,800
ALLOWANCE FOR LOAN LOSSES [Abstract]
Look back period														7 years
Property, Plant and Equipment [Line Items]
Basic (in dollars per share) | $ / shares		$ 0.24	$ 0.22	$ 1.07	$ 0.15	$ 0.07	$ 0.35	$ 1.15	$ 0.05	$ 0.23	$ 0.35	$ 0.57	$ 0.16	$ 1.68	[1]	$ 1.62	[1]	$ 1.31	[1]
Diluted (in dollars per share) | $ / shares		$ 0.24	$ 0.22	$ 1.06	$ 0.15	$ 0.07	$ 0.35	$ 1.14	$ 0.05	$ 0.23	$ 0.35	$ 0.56	$ 0.16	$ 1.67	[1]	$ 1.61	[1]	$ 1.30	[1]
Net change in loans receivable														$ 493,381		$ 274,840		$ 217,985
FRB [Member]
Investment Holdings [Line Items]
Interest bearing deposits		$ 4,200												4,200
FHLB [Member]
Investment Holdings [Line Items]
Interest bearing deposits		$ 16,000												$ 16,000
Common Stock [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Stock split, conversion ratio	3
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises, furniture and equipment, estimated useful lives														10 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises, furniture and equipment, estimated useful lives														40 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises, furniture and equipment, estimated useful lives														2 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises, furniture and equipment, estimated useful lives														15 years
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Retained earnings																				$ 2,000
[1] All share and per share data for all periods presented has been adjusted to reflect the 3-for-1 forward stock split of the Company's common stock effected by the Company on October 4, 2018.

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